设函数f{x}=log2x-logx4{0＜x＜1}.数列{An}的通项An满足f{2的an次方}=

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f{2的an次方}=log2*（2的an次方)-log2的an次方4,{0＜x＜1}=an-2/an=2n
an^2-2an*n-2=0,an^2-2an*n+n^2=2+n^2,an=(2+n^2)^1/2-n,或是an=-(2+n^2)^1/2-n,因为0